Air pump or compressor



Jan. 15, 1924.'

F. J. PAYNE Ejr AL AIR PUMP OR COMPRESSORV Filed May 14, 192s Patented Jan. 15, 1924.

UNITED lSTATES` .PATENT OFFICE.

'. o FREDERICK JAMES PAYNE AND PERCY CHARLES PAYNE, F KEYNSHAM, NEAR BRISTOL, ENGLAND. f

.AIR PUMP yOR (.'OIVIPRIISSOR.y f

Application led May 14, 1923. Serial No. 638,767.

To all whom t may concern.'

'Be it known that we, FREDERICK JAMES PAYNE and PnRcY CHARLES PAYNE, Subjects of the King of Great Britain andIreland, and residents of Keynsham, near Bristol, in the county of Somerset, England, have invented certain new and usefullmprovements in Air Pumps or Compressors, of which the following is a specification.

This invention has reference to doubleacting multi-stage pumps or compressors for iniiating pneumatic tyres and other purposes, and to pumps or compressors of the type comprising a plurality of single-acting cylinders, the cylinders of each stage being co-axial and tted with connected pistons which are actuated by a common operating member.

The invention has for its object to provide an improved and simplied construction of pump or compressor of the kind referred to. In the accompanying drawing Fig. 1 is a longitudinal section of one embodiment of the invention in a two-stage or compound pump especially intended for the inflation of the pneumatic tyres of motor road vehicles, Fig. 2 is a part end view of, and a part transverse section on the line 2 2 in Fig. 1, and Fig. 3 is a section on the line 3--3 in Fig. l.

Referring to the drawing, 4, 4 are two half casings having formed in them low pressure cylinders 5, 5a and high pressure cylinders 6, 6a respectively, the high pressure cylinders being arranged vertically above and parallel to the low pressure cylinders. The half casings are assembled with their respective low pressure cylindersl and high pressure cylinders in axial alignment, and the casings are joined ina plane midway between the co-aXial cylinders 6, 6'r1 and 5, 5L1 and `secured together by bolts 7 passing through lugs 8. The low pressure cylinders 5, 5' are fitted with pistons 9 9a which are connected to and coupled toget er by a common rod 10. Similarly, the high pressure cylinders 6, 6a are fitted with pistons 11, 11a connected to and coupled together by a rod 12. The pistons 9, 9aL and 11, 11l are furnished with cup leathers 13.

The pairs of coupled pistons are simultaneously reciprocated in opposite directions by a rocker lever 14 provided with a trunnion 15 which is mounted in a bearing 16 formed on the casing parts 4, 4a and through which the trunnion passes tothe outside of the casing. The outer end of the trunnion 15 is provided with a socket 17 to receive a hand lever whereby the trunnion and lever 14 `can be rocked to reciproen cate the pairs 'of pistons.` The ends of the rocker lever `14 are forked and'have mounted in'them rollers 18, 19 which respectivelyI co-act with a closed slot 204in the piston rod 10"and' an open-ended slot or notch 21 in 65 the piston rod' 12. The cylinders 5, 5a are provided with inlet ports 22, 22a rwhich are uncovered and opened by the pistonsr 9, 9a `at the end of `their idle strokes and are swept over by the 7o pistons during their operative strokes. Communication from the low pressure cylinders 5, 5a to the high pressure cylinders is aEorded by the portsl 23, 23, valve chambers 24, 24a, wherein are fitted upwardly-opening 75 non-return valves 25, 25a which seat over the upper ends of the por-ts 23, 23a, and

ports 26, 26a. The chambers 24, 24*1 also serve yto receivevalve casings 27, 27a, the lower `ends of which are open to the chamso bers v,and wherein are arranged upwardlyopening non-return valves 28, 28a. Screwed into'the upper ends of thecasings 27, 27a are nozzles 29, '293, thedepending portions of which are `open to the casings and also conununicate by radial holes 30, 30a with chambers resulting between the casings and distance pieces or sleeves 31, 31a clamped between the iiang'es of the nozzles 29, 29a and the casings parts 4, 4, packing rings 90 32 ensuring air-tight joints. The distance pieces or sleeves 31, 31a are connected, by an external tube 33 which establishes communication between the chambers formed bythe distance pieces or sleeves. A nipple 34 on the nozzle 29 has connected to it a flexible hose k35 for conducting the air under pressure to the tyres and a ynipple 34a on the nozzle 298L has i'itted to it a pressure gauge 36.

The stems of the valves 25, 25a and 28, 28iL are referably of triangular cross-section as s own in Fig. 3, or equivalent crosssection, so that while they are maintained centrally in position, spaces result for the 105 passage of the air.

From the above description it will be manifest that air compressed in the lowpressure cylinders 5, 5* will be discharged into the high pressure cylinders 6, 6a and 110 after further compression fthefreinwill loe discharged 'through the nippler 34 Vanc'l'hose to vthe tyre, the air from the cylinder 63"" tween the cri-axial pistons or" cylinders of passing` by way 'of the-tube-to the nipple 34. lt will 'also be manifest that each pair of complementary low and high pressure cylinders constitutes a. single-acting coinpound puinp giving an intermittent delivery, and that the two'pairs of'complementary llow and high pressurerylinders together io'rm a "double-'acting compound pump yielding a constant delivery vand that, accordingly, fthe higher pressure above Lthe valves' 28,' 28a created b'ythe discharges from they high pressurecylinders ,6,6 ,will

4prevent such valves froinb'eing openedhy the Lair dischargedpfrom pressure cylindersto the high pressure cylinders.

" Various modiiications maylefinade in the construction 'described above without departing` from thespirit "olf lthe .invention For eiganiple, instead of the yair discharged from the cylinder 6L1 being trans'ferredto the delivery nozzlelloy the externalftube l53, `such transfer may' heneffected through a conduit1 provided in ,they `casing parts'e, Lia. It is, however, ipreiferredto employ thelexvteriial tube as vit removes the necessity for packing between the twofcasing"y parts.

' YVhat vwe Claim as our invention fand desire to secure by 4Letters Patent iszwl. A `multi-stage;air pump or compressorcomprisinglin combination, two half casings each containing` complementary cylinders of each stage, assembled witlrthe' cylinders of like. Stages in axial alignment .and

joined together" in planeinidway between the co-zaXial cylinders; connected-pistons in each two 4cio-,axial cylinders, a rocker Vlever operatively engaged with'the conne'ctedpistons of each stage, a trunnion on'whjich said' rocker lever is mounted and'whichextends to theoutside of the casing parts, land means Jfor operating said trunnion to" rock said rocker -lever to reciprocatezthe connected p'StQnS- i "21A multistage airpump 'or compressor comprising in combination, u two single-'acting multi-stage pumps 'or 'compressors `as,-

sembled with the cylinders of like stages cio-axial and joined together in a' plane midway between said cylinders, connections belilre sta-ges, a rocker lever operatively engaged with the connections of the pairs of connectedA pistons to reciprocate the pairs olf-,pistons of succeeding stages in opposite directions,'it'` triinnion on which said rocker lever is mountedtandwhich extends to the or'side of the pump or compressor, means iioroperating said trunnion to roel: said roel/enlever to reciprocate the pairs of connectedfpistous, means loradmitting;` `,air to the c ylinders'ofthe rst stage,"means for conducting fthe air from the cylindersV or one stageA tothe complementary cylinders ot the next stage, and means for conducting the air irointhe cylindersfot' the last stage to common foul-let.

A 'double-acting two-stage Aair pump or kcompressor'K'comprising in"`comhination, two .casingparts each containing complementary vlinders ot" the two stages assembled with cylinders oi" lilre 'stages colaXial and ined together in a plane'midwayhetween ud co-aXial cylinders, pistons in each two co-axial cylinders connected to and coupled togetherhy a common rod, ,a rocker lever operativelyconnected with said rods, a" trunnion o-n which said rocker lever is mounted kand whichr is mounted in and eX tends 'tothe outside of said casing parts, ansior actuating the outer Vend of said ti nnion torook thev said rocker lever to reciprocate the pairs oi connected pistons in oj'iposite directions, inlet, ports to the'cylinders oitlie iirststagdports for conducting the air from the 'cylinders of the first stage to the cylinders of the secondstage, valves Vercontrolling'saidports, means for conrnennnioir autres rerun@ PER@ fCHfRL-SPAYNE- 

